Post an array of Objects along with other contents using Retrofit

Question

i would like to post an array of objects along with other kind of formdata.

Something like

{
  country: "us",
  province: "ny",
  cities: [{
    name: "hello",
    size: "small"
  }, {
    name: "hi",
    size: "big"
  }]
}

How do I do this in retrofit? I only need the part where it is declaring the retrofit client api.

@FormUrlEncoded
@PUT("user/doStuff")
Observable<Void> doStuff(@Field("country") String country, @Field("province") String province,
/* What do i do with cities here?? */);

Cătălin Florescu · Accepted Answer · 2017-01-13 21:59:33Z

3

You can try something like this, but depends how server is configured.

public class City {
    @SerializedName("city")
    public String city;

    @SerializedName("size")
    public String size;
}

public class ObjectToSend {
    @SerializedName("country")
    public String country;

    @SerializedName("province")
    public String province;

    @SerializedName("cities")
    public List<City> cities;
}


@PUT("user/doStuff")
Observable<Void> doStuff(@Body ObjectToSend object);

answered Jan 13, 2017 at 21:59

Cătălin Florescu

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4 Comments

Zhen Liu Over a year ago

This will work. But is there a way to do it generically? Say. Is it possible to pass an JSONObject[] as cities ?

Cătălin Florescu Over a year ago

What do you mean in "generically"? Gson is faster than JsonObject. And if you use retrofit with rxjava, is recommended to use like this, my example. It will work like a charm.

Zhen Liu Over a year ago

For example. My "user/doStuff" api will actually accept a different range of objects. Is it possible to have this retrofit thing to also accept a generic type like JSONObject. And then in my application. I can just invoke some method to convert my object into jsonObject and then i can pass them over.

Cătălin Florescu Over a year ago

You can try to convert them to string, idk. Retrofit is more specific object oriented. In the end, entire object that you want to send will become a string.

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